How do I Disable VLAN's for OpenWRT 23

I have a Linksys WRT1900AC router with openwrt 23 that I am trying to connect to my fibre internet. For the configuration to work my ISP has stated that I need to disable VLAN's. When I look at the settings on their provided router there is a specific button that disables VLAN Is there an equivalent way of doing this in OpenWRT?

Question by Mr. J on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.